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websocket,提供客户端与服务器之间交流的双工协议(见拙作《WebSocket》),使用spring boot,可以很方便地提供websocket的服务器端。
主要是标上几个注解。
主体代码:mySocket.java
import javax.websocket.*; import javax.websocket.server.ServerEndpoint; import java.io.IOException; import java.util.concurrent.CopyOnWriteArraySet; @ServerEndpoint("/ws") @Component public class CaptureSocket { private final static Logger LOGGER = LoggerFactory.getLogger(CaptureSocket.class); private static CopyOnWriteArraySet<CaptureSocket> set = new CopyOnWriteArraySet<>(); private Session session; @OnOpen public void onOpen(Session session) throws IOException,InterruptedException { this.session=session; set.add(this); LOGGER.info("新连接来自:" + session.getRequestURI().getHost()); } @OnClose public void onClose(){ set.remove(this); LOGGER.info("连接关闭:" + this.session.getRequestURI().getHost()); } @OnMessage public void onMessage(String message,Session session){ LOGGER.info("来自客户端消息:" + message); } @OnError public void onError(Session session,Throwable err){ LOGGER.info(err.getMessage()); err.printStackTrace(); } }
配置文件:mySocketConfig.java
import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.server.standard.ServerEndpointExporter; @Configuration public class CaptureSocketConfig { @Bean public ServerEndpointExporter serverEndpointExporter(){ return new ServerEndpointExporter(); } }
这个配置文件无须显示调用,系统会自动解释。究其原因,应该是标注“@configuration”起了作用。
此配置文件的作用,从代码来看,是为了配合解释服务器端点用的?,主体代码mySocket.java里有个标注: @ServerEndpoint("/ws")
相应的客户端代码有:
var ws; function wsconnect() { var ws = new WebSocket("ws://192.168.0.98:8085/ws");//最后一个ws应该就是EndPoint ws.onopen = function(evt) { console.log("Connection open ..."); ws.send("hello socket!"); }; ws.onmessage = function(evt) { console.log("receive message: " + evt.data + ":" + (new Date())); }; ws.onclose = function(evt) { console.log("Connection closed.Reconnect will be attempted in 1 second.", evt.reason); setTimeout(function() { ws = wsconnect(); }, 1000); }; ws.onerror = function(err) { console.error('Socket encountered error: ', err.message, 'Closing socket'); ws.close(); }; return ws; } $(function(){ ws = wsconnect(); });